IIT JEE Practice Question and Answer

Q: Which path through the carbon cycle is possible? 1602 0

  • 1
    Animal ----> Plant ----> Atmosphere
    Correct
    Wrong
  • 2
    Plant ----> Animal ----> Atmosphere
    Correct
    Wrong
  • 3
    Atmosphere ----> Plant ----> Animal
    Correct
    Wrong
  • 4
    Plant ----> Atmosphere -----> Animal
    Correct
    Wrong
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Answer : 2. "Plant ----> Animal ----> Atmosphere"
Explanation :

Answer: B) Plant ----> Animal ----> Atmosphere Explanation: During daylight hours, plants capture carbon dioxide from the atmosphere and use it to make carbohydrates which is stored as starch in the plant. Animals feed on the plants and extract the carbohydrates through their digestive system. The carbohydrates, namely glucose, are used by the animals for production of ATP through cellular respiration.   Cellar respiration in the animals produces carbon dioxide as a waste product. The carbon dioxide is released into the atmosphere, from where it is again captured by plants and the cycle is repeated.   Hence, option B) Plant ----> Animal ----> Atmosphere is the path possible in carbon cycle.

Q: How many six digit odd numbers can be formed from the digits 0, 2, 3, 5, 6, 7, 8, and 9 (repetition not allowed)? 1602 0

  • 1
    8640
    Correct
    Wrong
  • 2
    720
    Correct
    Wrong
  • 3
    3620
    Correct
    Wrong
  • 4
    4512
    Correct
    Wrong
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Answer : 1. "8640"
Explanation :

Answer: A) 8640 Explanation: Let the 6 digits of the required 6 digit number be abcdef Then, the number to be odd number the last digit must be odd digit i.e 3, 5, 7 or 9 The first digit cannot be ‘0’ => possible digits = 3, 5, 7, 2, 6, 8 Remaining 4 places can be of 6 x 5 x 4 x 3 ways This can be easily understood by Therefore, required number of ways = 6 x 6 x 5 x 4 x 3 x 4 = 36 x 20 x 12 = 720 x 12 = 8640 ways.

Q: What is the full form of "RADAR" ? 1601 0

  • 1
    Radio Detecting and Ranging
    Correct
    Wrong
  • 2
    Region Device and Ranging
    Correct
    Wrong
  • 3
    Radio Detect and Rangs
    Correct
    Wrong
  • 4
    Radio Device and Ranging
    Correct
    Wrong
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Answer : 1. "Radio Detecting and Ranging"
Explanation :

Answer: A) Radio Detecting and Ranging Explanation:

Q: Highest Jute producing state in India? 1601 0

  • 1
    Gujarat
    Correct
    Wrong
  • 2
    West Bengal
    Correct
    Wrong
  • 3
    Uttar Pradesh
    Correct
    Wrong
  • 4
    Bihar
    Correct
    Wrong
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Answer : 2. "West Bengal"
Explanation :

Answer: B) West Bengal Explanation: West Bengal is the highest Jute producing state in India followed by Bihar and Assam in second and third place. Gujarat is the largest Cotton producing state in India.

Q: Who prepares the topographical maps of India? 1601 0

  • 1
    Defence Ministry
    Correct
    Wrong
  • 2
    Geological Survey of India
    Correct
    Wrong
  • 3
    Survey of India
    Correct
    Wrong
  • 4
    Geographical Survey of India
    Correct
    Wrong
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Answer : 3. "Survey of India"
Explanation :

Answer: C) Survey of India Explanation: Survey of India publishes maps and the unrestricted category maps can be obtained at very affordable prices from its several Geospatial data centers. Restricted category maps require due approval from government authorities. Many other rules govern the sale and use of Survey of India maps. Only an Indian citizen may purchase topographic maps and these may not be exported from India for any reason.   The Survey of India is India's central engineering agency in charge of mapping and surveying, set up in 1767. Its members are from Survey of India Service cadre of Civil Services of India. It is headed by the Surveyor General of India.

Q: Where is the sheet number on a map found? 1601 0

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Answer :
Explanation :

The sheet number on the map is found in bold print in both the upper right and lower left areas of the margin.

Q: What role does Dalvik play in Android development ? 1600 0

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Answer :
Explanation :

Dalvik serves as a virtual machine, and it is where every Android application runs. Through Dalvik, a device is able to execute multiple virtual machines efficiently through better memory management.

Q: The average age of 80 boys in a class is 15. The average age of group of 15 boys in the class is 16 and the average of another 25 boys in the class is 14. What is the average age of the remaining boys in the class ? 1599 0

  • 1
    12.24 yrs
    Correct
    Wrong
  • 2
    13.25 yrs
    Correct
    Wrong
  • 3
    16 yrs
    Correct
    Wrong
  • 4
    15.25 yrs
    Correct
    Wrong
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Answer : 4. "15.25 yrs"
Explanation :

Answer: D) 15.25 yrs Explanation: Total ages of 80 boys = 15 x 80 = 1200 yrs.Total age of 16 boys = 15 x 16 = 240 yrsTotal age of 25 boys = 14 x 25 = 350 yrs.Average age of remaining boys = 1200 - (240+350) / 80 - (25+15) = 610/41 = 15.25 yrs.

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